Homemade Battery Packs

Batteries, Chargers, and Battery Management Systems.
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DrkAngel   100 GW

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Posts: 5155
Joined: Dec 15 2010 11:14am
Location: Upstate-Western-Southern Tier NY. USA

Re: Homemade Battery Packs

Post by DrkAngel » Sep 02 2019 7:49am

DrkAngel wrote:
Sep 01 2019 10:00am
.
...
13s BMS's, many 40A and higher.
40Ah battery is not so much a factor, as expected Amp draw. Controller Amp rating is a more accurate indicator of needed BMS.

Sorry - forgot to add link to "13s BMS" ... fixed now.

Added 14s link also.

14s BMS

14s, vs 13s is often the difference of reaching 30mph, or not quite ...
Though, with my multitude of 3s2p LiPo, a 15s BMS might be my choice for for a "48V" battery.

48V 750w hub motor ...

Series .... Nominal V ... Charged V ...
12s .......... 43.2V .......... 50.4V = 720w motor output
13s .......... 46.8V .......... 54.6V = 775w motor output
14s .......... 50.4 ........... 58.8V = 840w motor output
15s .......... 54V ............. 63V = 900w motor output - confirm > 63V caps? (61.5V = charged to, lifesaving, 4.10V per cell)
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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Hillhater   100 GW

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Re: Homemade Battery Packs

Post by Hillhater » Sep 02 2019 6:21pm

DA... sorry to drift a little OT..but, ref Capacity Mapping,...
.....have you ever done a “capacity Map” for the Boston Power 5300 cell ?
viewtopic.php?f=14&t=90938
I checked but could not find one in your extensive index .
Thanks ..HH
This forum owes its existence to Justin of ebikes.ca

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DrkAngel   100 GW

100 GW
Posts: 5155
Joined: Dec 15 2010 11:14am
Location: Upstate-Western-Southern Tier NY. USA

Re: Homemade Battery Packs

Post by DrkAngel » Sep 04 2019 7:41am

Hillhater wrote:
Sep 02 2019 6:21pm
DA... sorry to drift a little OT..but, ref Capacity Mapping,...
.....have you ever done a “capacity Map” for the Boston Power 5300 cell ?
viewtopic.php?f=14&t=90938
I checked but could not find one in your extensive index .
Thanks ..HH
Did a quick Capacity map in "Capcity Mapping thread", see - Boston Power Swing 5300
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

New & Improved - Acronym Definitions

Index - Homemade Battery Packs - Updated - February 2019

EBike Toolbox - Bargains! $

Endless Sphere Wiki - Lost?

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